/**
 *  Copyright [2011] Steffen Kämpke
 *  mailto: steffen.kaempke@pennychecker.de
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.pennychecker.example.handler;

import com.google.inject.Inject;
import com.pennychecker.example.action.SaveUser;
import com.pennychecker.example.action.SaveUserResult;
import com.pennychecker.example.mvp.model.User;
import com.pennychecker.example.repository.UserRepository;
import net.customware.gwt.dispatch.server.ActionHandler;
import net.customware.gwt.dispatch.server.ExecutionContext;
import net.customware.gwt.dispatch.shared.ActionException;
import net.customware.gwt.dispatch.shared.DispatchException;

/**
 *
 * @author Steffen Kämpke mailto:steffen.kaempke@pennychecker.de
 */
public class SaveUserHandler implements ActionHandler<SaveUser, SaveUserResult> {

    private final UserRepository userRepository;

    @Inject
    public SaveUserHandler(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    public Class<SaveUser> getActionType() {
        return SaveUser.class;
    }

    public SaveUserResult execute(SaveUser a, ExecutionContext ec) throws DispatchException {
        final User user = a.getUser();
        try {
            userRepository.save(user);
        } catch (Exception ex) {
            throw new ActionException(ex);
        }

        return new SaveUserResult(user);
    }

    public void rollback(SaveUser a, SaveUserResult r, ExecutionContext ec) throws DispatchException {
        try {
            userRepository.remove(r.getUser());
        } catch (Exception ex) {
            throw new ActionException(ex);
        }
    }
}
